顯示器系統白點因為使用者需求而有不同色溫模式，所以大部分顯示都會提供多個色溫模式讓使用者選擇。在過去文獻中並未表示如何設計系統白點，使顯示器調整至多個色溫模式是最佳化的亮度。本研究探討顯示器在三種情況下，設計最佳化系統白點。第一種為三原色顯示器中有兩個色溫模式、第二種為四原色顯示器中有兩個色溫模式和第三種為三原色顯示器有三個色溫模式。在三種情況下以損失亮度最少之方式找到最佳化之系統白點，並找出顯示器原色之最佳亮度分配，並發現最佳化之系統白點調整至多個色點時是相同亮度。 本研究從色彩學理論為基礎，推導出最佳化系統白點之理論，並且用電腦程式模擬找出最佳值，然後將理論值與模擬值比較驗證。我們利用投影機及積分球設計實驗，將實驗值、模擬值與理論值做比較後做誤差分析，在三種情況下之色差誤差 分別為0.0013、0.0013及0.0021，發現色差誤差都容許誤差0.003之內。在三種情況下之亮度誤差 分別為0.0289、0.0789及1.1099，亮度誤差也在容許誤差1.168之內。最後做誤差來源分析發現誤差是由投影機光源之不穩定所產生。The system white point of displays has many color temperature modes for users to choose their favorite mode. But there is no research for designing the best system white point. So this paper was purposed to design the best system white point for three cases. Case one is designing the best system white point for two color temperature modes by tri-primary color display. Case two is designing the best system white point for two color temperature modes by four-primary color display. Case three is designing the best system white point for three color temperature modes by tri-primary color display. This paper uses the optimal method that loses minimal brightness to find the best system white point for three cases. And also we discover the best system white point converting to seveal color temperature modes with the same brightness. Our formula of best system white point is based on color therom. And we simulated and verified the design. Then we implemented the experiments by the projector and the integrating sphere. Finally we compared the values of formulas, simulations and experiments. The values of color difference tolerance for three cases were 0.003, 0.0013 and 0.0021. These color difference tolerances were less than the allowable error 0.003. The values of brightness tolerance were 0.0289, 0.0789 and 1.1099. These brightness tolerances were less than the allowable error 1.168. Finally the causation of errors produced from the unstable lamp of projector.
